Adding Constant class for Receiver.
Start refactoring DexcomReader

Use Constants and a PacketWriter
Start work on Generic reads
Merge pull request #10 from saercnap/receiver-read-write-refactor

Generic writes and partial generic reads
Revert to old reader and plan on creating new.
Delete unused class.
Adding record director with MeterRecord.
Change class name and some adds and cleanup.
Adding new EGRecord class, still needs some work.
Make MeterRecord implement Serializable.
Add ReadPacket class that generically translates a read packet.
Add TODO note.
Adding new receiver reader class that will replace old one, needs lots of work.
Adding new CRC16 static class.
Adding GerericXMLRecord class.
Fixed trend on EGRecord class.
Added Manufacturing data to page reader.
Added readSerialNumber method.
Cleanup of mystery number.
Cleanup TODO statement.